My 86 toyota mr2 over heats about 10 minutes into running it. the anti-freeze leaks out from around the head gasket but the oil and the anti-freeze isn't mixed together. i'm not sure if i should replace the head gasket or if there is another problem.

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This sounds like a water pump leaking. Get a mirror and see if you can see the place where the leak is coming from. On the water pump is a small hole, this hole is called a "weep hole". it is there to warn that the water pump is getting worn and may fail soon. Anti-freeze, once it leaks on to the engine and gets warm enough to dehydrate then gets some road dirt stuck to it, it does looks a lot like oil and feels a lot like oil. I think your are looking at a coolant leak coming from your water pump. A shop can pressure test the coolant system and find out if it is the water pump or a head gasket. Hope this helps FixYa up.

I would run a cylinder leak tester. It sounds to be a cylinder head gasket leak. I assume there is no oil in the anti freeze, or anti freeze in the oil? They sell these "combustion leak tester" on ebay for around $30. easy to use.
If this is not problem then you will almost certainly need a new radiator

usually white smoke is caused by water or anti freeze entering cylinder. in radiator or overflow the coolant will look like a chocolate milk shake. check on oil dipstick for traces of water or anti freeze. this would indicate a bad head gasket. look around head at gasket, and see if you can see any leaks. Most symptoms of a blown head gasket can be diagnosed through careful observation As the coolant heats up, and pressure rises, it will be forced into the cylinder during the intake stroke. This coolant will flash into steam during combustion and will be visible as a white cloud coming from the tailpipe. it may not even be a head gasket thats bad, cause usually if headgasket is bad, engine will overheat!! but if a bad gasket vehicle would miss and loose power. also check the pcv system ( positive crankcase valve ). hope this helps ! check system first !!

Check all the wiring connections that you loosened or took off when you removed the head. something is loose or disconnected ,eg., ground wires .
Make sure you have spark at spark plugs whemn cranking ,and fuel pressure.
Did you try spraying starting-fluid in the intake, see if the engine runs for a little bit.
Compression to be anything above 100 psi will firean engine ,sometimes lower too.

First thing to check is the radiator cap seal. If it is not sealing properly, the water will boil off and then soon, the anti freeze will begin to disappear. Clean the metal surfaces and gasket and make sure it is tight ---or buy a new cap --but make sure there is a seal. If that doesn't cure it, you may have a head gasket leak that blows the coolant (anti freeze) into one cylinder. If that cylinder is tight, the coolant will only evaporate in the heat and be blown out the exhaust --not entering the oil pan. Check your exhaust when you start up. You may see white smoke, or even liquid, exiting the exhaust pipe, indicating a blown head gasket (then engine may run rough, too). If this is the case, there are reasonably inexpensive cures for this in some cases.

If there is no visable water drip, or puddle, then it sounds like a head gasket could be the problem as they are aluminum engines. I used a block sealer from the auto parts store and solved my proble. It was called block seal, and has copper in it. Cost - $8.00, but you will also need anti-freeze and a flush kit, as you have to remove all the water and anti-freeze for the stuff to work. Hope this helps, can't hurt. Good luck.